For many, John Sweeney is known as the now former head of the AFL-CIO, a position from which he retired in 2009 after 14 years of service. For most of the previous 35 years, though, he was a member turned officer of the Service Employees International Union, having served 15 of those years as its President. The SEIU Executive Office: John Sweeney Records document his tenure during these 15 years, although portions of these records predate his tenure in that office.

The records contain files documenting the activities of SEIU local unions, joint councils and other SEIU affiliates. In addition, the files of SEIU executive board members, vice presidents, divisions, departments and staff members are also found within the collection, often within series identified in this manner. Researchers can also review records documenting the meetings, hearings, conventions and conferences Sweeney attended and at which he often spoke or testified. Records documenting SEIU's conventions from its inception in 1921 until 1992 are also found within these records. The records of the conventions reveal the major policy shifts of the union. Sweeney's interest in healthcare are also found within these records in addition to the union's external relationships with labor organizations and others.